Effect of the Support on the Nature of Metal–Promoter Interactions in Ru–Cs+/MgO and Ru–Cs+–Al2O3 Catalysts for Ammonia Synthesis Full article
| Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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| Output data | Year: 2005, Volume: 46, Number: 6, Pages: 891-899 Pages count : 9 DOI: 10.1007/s10975-005-0153-1 | ||||
| Tags | Al2O3; Ruthenium; Cesium; Lower Binding Energy; Cs2CO3 | ||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Russian Foundation for Basic Research | 02-03-32681 |
| 2 | Zamaraev International Charitable Scientific Foundation |
Abstract:
The Ru-Cs+/MgO and Ru-Cs+/γ-Al2O3 catalysts, which were prepared by an impregnation method using RuOHCl3 and Cs2CO3 as precursor compounds and reduced with H2 at 450°C, are characterized by X-ray diffraction, high-resolution transmission electron microscopy (with X-ray microanalysis), and X-ray photoelectron spectroscopy (XPS). The Cs+/MgO(Al2O3) systems, Ru-Cs+ black, and model systems prepared by cesium sputtering onto polycrystalline ruthenium foil are studied as reference samples. It is found that, in the Ru-Cs+/MgO sample, cesium is present as a Cs2 + x O cesium suboxide, which weakly interacts with the support, localized on the surface of Ru particles or near them. In the case of Ru-Cs+/γ-Al2O3, cesium occurs as a species that is tightly bound to the support; this is likely surface cesium aluminate, which prevents promoter migration to Ru particles. The Ru-Cs+/MgO sample exhibits a considerable shift of the Ru3d line in the XPS spectra toward lower binding energies, as compared to the bulk metal. It is hypothesized that this shift is due to a decrease in the electron work function from the surface of ruthenium because of the polarizing effect of Cs+ ions in contact with Ru particles. Based on the experimental results, the great difference between the catalytic activities of the Ru-Cs+/MgO and Ru-Cs+/γ-Al2O3 systems in ammonia synthesis at 250–400°C and atmospheric pressure is explained.
Cite:
Larichev Y.V.
, Moroz B.L.
, Moroz E.M.
, Zaikovskii V.I.
, Yunusov S.M.
, Kalyuzhnaya E.S.
, Shur V.B.
, Bukhtiyarov V.I.
Effect of the Support on the Nature of Metal–Promoter Interactions in Ru–Cs+/MgO and Ru–Cs+–Al2O3 Catalysts for Ammonia Synthesis
Kinetics and Catalysis. 2005. V.46. N6. P.891-899. DOI: 10.1007/s10975-005-0153-1 WOS Scopus РИНЦ ANCAN OpenAlex
Effect of the Support on the Nature of Metal–Promoter Interactions in Ru–Cs+/MgO and Ru–Cs+–Al2O3 Catalysts for Ammonia Synthesis
Kinetics and Catalysis. 2005. V.46. N6. P.891-899. DOI: 10.1007/s10975-005-0153-1 WOS Scopus РИНЦ ANCAN OpenAlex
Original:
Ларичев Ю.В.
, Мороз Б.Л.
, Мороз Э.М.
, Зайковский В.И.
, Юнусов С.М.
, Калюжная Е.С.
, Шур В.Б.
, Бухтияров В.И.
Влияние носителя на природу взаимодействия металл-промотор в Ru-Cs+/MgO- и Ru-Cs+/Аl2O3-катализаторах синтеза аммиака
Кинетика и катализ. 2005. Т.46. №6. С.940-948. RSCI РИНЦ
Влияние носителя на природу взаимодействия металл-промотор в Ru-Cs+/MgO- и Ru-Cs+/Аl2O3-катализаторах синтеза аммиака
Кинетика и катализ. 2005. Т.46. №6. С.940-948. RSCI РИНЦ
Dates:
| Submitted: | Jan 26, 2005 |
| Published print: | Nov 1, 2005 |
Identifiers:
| Web of science: | WOS:000234409400018 |
| Scopus: | 2-s2.0-30344482585 |
| Elibrary: | 13494433 |
| Chemical Abstracts: | 2006:18593 |
| Chemical Abstracts (print): | 144:220093 |
| OpenAlex: | W2049132820 |